Wireless telegraphy.



' PATBNTED MAY 26, 1903. J; F. KING. WIRELESS TBLEGRAPHY. APPLICATION FILED JULY 23. 1902.

K0 MODEL.

and;

1i: NORRIS PETERS co., wasmycrmv,

UNITED STA E Patented May 26, 1903.

PATENT F C WIRELESS TEILECRAPHY.

SEECIFICATIQN forming part bf Letters Patent No. 729,497, d'ated'May 2e, 1. 903.

Original applicationfiled February 5, 1902, Serial No. 92,695. Divided and this applicationjfilod July 23, 1 902 Serial;

- I I N0; 116,676. (Ito model.

.To all whom, it may concern:

3e it known that 1, JAMES Fosrnn KING, a citizen of the United States, residing at New York, in the county of New York and State I of N cu York, haveinvented certain new and useful Improvements iiflVi rcless 'leiegraphy;

and 1 do hereby declare the following to be a tull, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

My present invention relates to improvements in Wireless telegraphy, and more especially to an improved form of receiving apparatus for the same, and embodies, among other things, an improved cohcrer and combined dccohercr and induction-coil.

My invention consists also in operating the receiving-relay usually employed in such sys tems upon a secondarycircuit having cur= rent induced in it from the coherer-circuit, as contradistinguished from the ordinary practice of operating the relay in the cohcrcr-circuit direct. p

l Myinvention COllSlStS,f\ll'tl161','ll1 improving the efficiency of the eoherer-particles by making each of magnetic metal thinly covered with a metal envelop or coating which i both non1nagnetic and non-oxidizable The apparatus embodying my present invention is shown and described in an applicationfiled byme February 5, 1902, and serially numbered 92,695, of which the present appli cation constitutes a division.

In order to more fully describeiny invention, reference will be had to the accompanying drawings, in u'hieh- I Figure 1 is a diagram representing the re ceiying apparatus .embm'lying my invention, and Fig. 2 represents iusidc elevation and partly in central vertical section the coherer "f and combined ('lccolnn-cr and induction-coil.

seliarated longitudiimlly by nsula t-ion of,

tube a, i

Similar lettersrefer to sim i l ar parts throughvor induced circuitf These plates are provided, respectively, with the platinum-Wire terminals a which. are

fused in the tube. On the upper surfaces netic core-iron, for example surrounded by v or enve oped in a very thin non-magnetic and non-oxidizablc covering, such as platinum, By thus providing the'ironcore with such a covering the particle is preserved against the dcs tructiveaction of sparks. Moreover,

, on account of the very low resistance of the platinum and its non-oxidizable propel-1 y better contact is formed and more current flows through the coherer than would other- Wise'be the case. Oxidation ofthe parts inside the coherer is further prevented by ex hausting the air from the tubc.

The top of the coherer-tubc is secured fast to a. magnet pole-piece (1. which is in turn securd to the iron core a of an induction-coil. -A thick copper-plated iron casing (1" supports theinduction-coil and surrounds .the coherer and protects itfrom local infiucmces. The '00 hererfterin'inal o connects to the aerial. wire a, which passes through. and is insulated from the core a and terminates in the sphere v a or its equivalent. The other coherer-tcr minal u makes connection with the metal casing 11", which maybe connected to earth if desired.

In contradistinction to other systems I work the receiving-relay l3 upon a secondary This circuit is the secondary a of the coherer iiiduction-coil,\\'hich is preferablyof fineGerman-silverwire,u'oun l to about the samc'resista-ncc as the coils of the relay. ll-1e-primary (l bt' iliisinduetion- 'coilis connected in series with the cohererplates, coherer-battery E, choking-Willi, and part of the aerial circuit. The connection 'fromthe primary to the cohercr-terlninal '11- is shownas made through the metal casing 0*; induction-coil are mounted on" suitable bobbins of insulation. slipped over the core and inclosed in a suitable casing (0 as shown in Fight? The self-induction of tho-choking- The primary and secondary coils o'fithis coil F must be sufiicient to damp out all the' waves that tend to pass through it, and hence through the battery E apd the primary of the coherer induction-coil.

The messages are received by oscillations striking the sphere a, connected to the aerial wire, causing the coherer particles to cohere, and thus complete the circuit of the battery E. This induces a current in the sec- Ondary of the coherer ind notion-coil connected to the relay B and at the same time energizes the magnet pole-piece, which raises the particles from the plates and causes them to decohere. This induced current, however, will not alone energize the magnet of the relay B'sufficiently to cause the said magnet-to attract it 'tongue, nor is the current from the battery D alone sufli'cient to operate the said relay; but the combined action of the battery and the induced current, when both are acting in the same direction, will'be suflicient to operate the said relay. Each time this relay is thus operated'it completes, through its tongue and contact, the local circuit of the sounder 0. Moreover, while theprimary or magnetic circuit of said induction-coil will" respond to each individual received impulse the secondary circuit of'said coil will respond only to major or principal vibrations.

Having thus described my invention, it is obvious that the same may be modified without departure from thespirit thereof; but

What I claim, and desire to secure by Letters Patent of the United States, is-

1. In receiving apparatus for wireless telegraphs, 8. coherer, and a combined'magnetic decoherer and induction-coil, the primary of 'said induction-coil comprising the excitingcoil of said decoherer,

2. A receiver for wireless telegraphs, comprising a, cohe'rer, a combined magnetic deco-r herer and inductionoil, and a local receiving circuit, the said ind u ction-coil acting both to excite the magnet of said decoherer and to induce current in the said receiving-circuit, from the coherer-circuit.

l 3. In receiving apparatus for wireless telegraphy, a coherer, a decoherer-magnet, an induction-coil wound on said magnet, the primary circuit of said induction-coil comprising the main coherer battery-circuit and the ex citing-coil for the decoherer, and local receiving apparatus operated by the secondary circuit of said'induction-eoil.

, 4.. In receiving apparatus for wireless telegcoherer connected therein and comprising a glass tube inclosing metal-plates insulated from each other, and cohering means for establishing electrical connection from one of said plates to another, of a decoherer-magnet pole-piece to which said coherer-tnbe is secured, a magnet-core secured to said polepiece, an induction-coil wound on said core, the primary circuit of said induction-coil comprising'the main coherer battery-circuit and the exciting-coil of said decohe'rer-magnet, and local receiving apparatus connected in the secondary circuit of said induction-coil.

6, In receiving apparatus for wireless telegraphy, an aerial circuit, a main coherer battery-circuit forming a branch of said aerial circuit, a choking-coil connected in said branch circuit, a'magnetic decoherer, an induction-coil wound on said magnet, the primary of said induction-coil comprisingthe ex: citing-coil for,said decoherer-magnet and the battery-circuit of said coherer, and local receiving apparatus connected in the secondary circuit of said induction-coil.

7. In receiving apparatus-for wireless telegraphy, a continuously-closed local receivingcircuit connected to a source of electricity, a receiving-instrument pormally excited by the current in said circuit but non-responsive thereto, and means operating upon the reception of a signal to increase the exciting-current of said instrument and to thereby render the 'same'responsive to said signal. V

8. In receivingapparatus forwireless 139168.- ra'phy, a local receiving-circuit connected to a source of electricity, a receiving instrument normally excited by the current in said circuit but non-responsive thereto, and means operating upon the reception of a signal independently of the ohmic'resistance of the said local receiving-circuit to increase the exciting-current of said instrument and to thereby render the same responsive tosaid signal. 7 9. In receiving apparatus forwireless-telegraphsystems; a local receiving-circuit; a source of electiicity connected thereto; receiving apparatus operated by said circuit, non-responsive to the normal current therein, but responsive to said current when augmented; a second source of electricity, and a receiver of electrical oscillations adapted to augment the exciting-current of said circuit by current from said second source, upon the reception of a signal. 10. In receiving apparatus for wireless telegraphy, a local receiving-circuit and a'sonrce of electricity normallyconnected therein, an

induction-coil, the secondary circuit of which forms 'a part of the said local-receiving-cficuit, a receiver of electrical oscillations operating said induction-coil and causing it upon the reception of a signal, to augment the electromotive force of said local circuit, and a local receiving-instrument connected in said local receiving-circuit, non responsive to the normal electromotive force thereof but responsivito the augmented electroinotive force.

11. Iii-receiving apparatus for wireless telegraph the combination with a coherer, of

an imluction-coil, the primary of which comprises the coherer battery-circuit, a local normall y closed rcceiving-circuit ineliuling the secondary of said induction-coil, a receiving instrument and a source ofelectricity connected in said local circuit, the said receiving instrument being non-responsive to the normal electro-motivc force of said local circuit but only to the electro notive force augmented by induction from said imluction-coil.

12. A receiver for wireless-telegrapli systems, comprising a coherer, and a combined decoherer and induction-coil, the magnetic circuit of said induction-coil hem capable of responding to each individual received im- 20 pulse while the secondary of said imluctioncoil responds only to major or principal vibra. tions.

metal covered with a metal which is both nonmagnetic and non-oxidizable.

15. A coherer particle for receivers of elecanother metal which is trical oscillations, consisting of iron covered with platinum.

Intestilnony whereof I aiiix my s gnature in presence of two witnesses.

J. FOSTER KING;

Witnesses:

WM. D. SULLIVAN, E. Y. DUDLEY. 

